Polygalaceae

The Polygalaceae or the milkwort family are made up of flowering plants in the order Fabales. They have a near-cosmopolitan range, with about 21 genera and ca. 900 known species[2] of herbs, shrubs and trees. Over half of the species are in one genus, Polygala, the milkworts.

Polygalaceae
Securidaca longipedunculata
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Polygalaceae
Hoffmanns. & Link[1]
Type genus
Polygala
Tribes

See text.

Distribution of the Polygalaceae
Synonyms
  • Diclidantheraceae J. Agardh
  • Moutabeaceae Pfeiffer
  • Xanthophyllaceae Reveal & Hoogland

The family was first described in 1809 by Johann Hoffmansegg and Johann Link.[3] In 1896, Robert Chodat split it into 3 tribes. A fourth tribe was split off from the tribe Polygaleae in 1992.[4] Under the Cronquist classification system, Polygalaceae were treated in a separate order of their own, Polygalales. Currently, according to the Angiosperm Phylogeny Group, the family belongs in Fabales.

Description

Polygalaceae are annual or perennial herbs, shrubs, shrublets, and small trees. Its zygomorphic, hermaphrodite, bisexual flowers have 3-5 petals and 5 sepals.[5][6] Its leaves are usually alternate, but may be opposite, fascicled, or verticillate.[5] Each flower usually contains 8 stamens, though this may range from 3 to 10. They are usually in 2 series.[6] The fruits of each plant can be a capsule, samara, or drupe.[5]

Tribes and genera

The Polygalaceae comprise the following genera,[5] with tribes based on various sources.[7][8][9][10][11][12]

Fossils
  • †Deviacer Manchester
  • †Paleosecuridaca Pigg, Kathleen B., M.L. DeVore & M.F. Wojc. 2008

Systematics

Modern molecular phylogenetics suggest the following relationships:[12][13][14][15][16][17]

 
 

Surianaceae (outgroup)

 
Polygalaceae
Xanthophylleae

Xanthophyllum

 
 
Moutabeae
 
 

Moutabea

 
 

Balgoya (now included in Moutabea)

 
 
 
 

Eriandra

 
 
 

Barnhartia

 
 

Diclidanthera

 
 
 
 
 
Carpolobieae
 

Atroxima

 
 

Carpolobia

 
 
Polygaleae
Clade I
 

Bredemeyera

 
 
 

Acanthocladus

 
 
 

Gymnospora

 
 
 

Hebecarpa

 
 

Badiera

 
 
 
 
 
Clade II
 
 

Securidaca

 
 
 
 

Phlebotaenia

 
 

Rhinotropis

 
 
 
 

Comesperma

 
 
 

Ancylotropis

 
 

Monnina

 
 
 
 
 
 
 
 

Asemeia

 
 

Caamembeca

 
 
 
 

Hualania

 
 
 
 
 

Heterosamara

 
 
 

Polygaloides

 
 

Polygala subgen. Chodatia

 
 
 
 
 

Salomonia

 
 

Epirixanthes

 
 
 
 
 

Polygala subgen. Polygala (Old World Clade)

 
 

Polygala subgen. Polygala (New World Clade)

 
 
 

Muraltia

 
 
 
 
 
 
 
 
 
 

References
  1. Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III" (PDF). Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Retrieved 2013-07-06.
  2. Christenhusz, M. J. M. & Byng, J. W. (2016). "The number of known plants species in the world and its annual increase". Phytotaxa. 261 (3): 201–217. doi:10.11646/phytotaxa.261.3.1.
  3. Harvard University; Royal Botanic Gardens Kew; Australian National Herbarium. "Polygalaceae". International Plant Names Index. Retrieved July 16, 2020.
  4. Eriksen, Bente (1993). "Phylogeny of the Polygalaceae and its taxonomic implications". Plant Systematics and Evolution. 186 (1/2): 33–55. doi:10.1007/BF00937712. ISSN 0378-2697. JSTOR 23674643. S2CID 32590790.
  5. "Polygalaceae Hoffmanns. & Link". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2020-04-14.
  6. "Polygalaceae". Flora of Victoria. Government of Victoria, Australia. Retrieved July 16, 2020.
  7. Abbott JR. (2011). "Notes on the disintegration of Polygala (Polygalaceae), with four new genera for the flora of North America". Journal of the Botanical Research Institute of Texas. 5 (1): 125–137. JSTOR 41972495.
  8. Pastore JFB. (2012). "Caamembeca: Generic status and new name for Polygala subgenus Ligustrina (Polygalaceae)". Kew Bull. 67 (3): 435–442. doi:10.1007/s12225-012-9360-x. S2CID 19252598.
  9. Pastore JF, Rodrigues de Moraes PL (2013). "Generic status and lectotypifications for Gymnospora (Polygalaceae)". Novon. 22 (3): 304–306. doi:10.3417/2010113. S2CID 85269764.
  10. Abbott JR, Pastore JF (2015). "Preliminary synopsis of the genus Hebecarpa (Polygalaceae)". Kew Bull. 70 (3): 39. doi:10.1007/s12225-015-9589-2. S2CID 22601207.
  11. Freire-Fierro A. (2015). Systematics of Monnina (Polygalaceae) (Ph.D.). Drexel University. Archived from the original on 2017-03-19. Retrieved 2017-03-19.
  12. Pastore JF, Abbott JR, Neubig KM, Whitten WM, Mascarenhas RB, Almeida Mota MC, van den Berg C (2017). "A molecular phylogeny and taxonomic notes in Caamembeca (Polygalaceae)". Syst Bot. 42 (1): 54–62. doi:10.1600/036364417X694935. S2CID 90353852.
  13. Persson C. (2001). "Phylogenetic relationships in Polygalaceae based on plastid DNA sequences from the trnL–F region". Taxon. 50 (3 (Golden Jubilee Part 5)): 763–779. doi:10.2307/1223706. JSTOR 1223706.
  14. Forest F, Chase MW, Persson C, Crane PR, Hawkins JA (2007). "The role of biotic and abiotic factors in evolution of ant dispersal in the milkwort family (Polygalaceae)". Evolution. 61 (7): 1675–1694. doi:10.1111/j.1558-5646.2007.00138.x. PMID 17598748. S2CID 37523521.
  15. Bello MA, Bruneau A, Forest F, Hawkins JA (2009). "Elusive relationships within order Fabales: Phylogenetic analyses using matK and rbcL sequence data". Syst Bot. 34 (1): 102–114. doi:10.1600/036364409787602348. S2CID 85655712.
  16. Abbott JR. (2009). Phylogeny of the Polygalaceae and a revision of Badiera (PDF) (Ph.D.). University of Florida.
  17. Mennes CB, Moerland MS, Rath M, Smets EF, Merckx VS (2015). "Evolution of mycoheterotrophy in Polygalaceae: The case of Epirixanthes". Am J Bot. 102 (4): 598–608. doi:10.3732/ajb.1400549. PMID 25878092.
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